25222661 has 2 divisors, whose sum is σ = 25222662. Its totient is φ = 25222660.

The previous prime is 25222649. The next prime is 25222669. The reversal of 25222661 is 16622252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22562500 + 2660161 = 4750^2 + 1631^2 .

It is a cyclic number.

It is not a de Polignac number, because 25222661 - 2¹⁴ = 25206277 is a prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 25222661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25222669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12611330 + 12611331.

It is an arithmetic number, because the mean of its divisors is an integer number (12611331).

Almost surely, 2^25222661 is an apocalyptic number.

It is an amenable number.

25222661 is a deficient number, since it is larger than the sum of its proper divisors (1).

25222661 is an equidigital number, since it uses as much as digits as its factorization.

25222661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 26.

The square root of 25222661 is about 5022.2167416391. The cubic root of 25222661 is about 293.2672955967.

The spelling of 25222661 in words is "twenty-five million, two hundred twenty-two thousand, six hundred sixty-one".